Alright, let's work through 63894223 times 63534802 step by step
63894223 × 63534802 = 63534802 × (63894223)
+ 63534802 × 3 yielding 190604406
+ 63534802 × 20 yielding 1270696040
+ 63534802 × 200 which equals 12706960400
+ 63534802 × 4000 what gives us 254139208000
+ 63534802 × 90000 that equals 5718132180000
+ 63534802 × 800000 producing 50827841600000
+ 63534802 × 3000000 producing 190604406000000
+ 63534802 × 60000000 resulting in 3812088120000000

= 4059506807248846
